先看效果圖咯~
現在幾乎每個App都會有引導頁,是不是感覺很炫很厲害,是以就想做出來一個學習一下~讓自己的App看起來更加的美觀~
現在來分析一下:
這個引導頁可以分為倆部分~
1.小紅點--來提醒這是第幾頁了~
2.“開始體驗”這個Button--可以進入主界面,但是要控制這個Button隻能在最後一頁出現
布局的話使用相對布局~
那現在來看看布局吧:
activity_main:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<RelativeLayout
android:id="@+id/rl"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="20dp">
<LinearLayout
android:id="@+id/linear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
</LinearLayout>
</RelativeLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="50dp"
android:visibility="invisible"
android:text="開始體驗"/>
</RelativeLayout>
開始體驗這個Button設定了不可見來控制在最後一頁出現~
小圓點還沒開始寫出來,隻是寫了個RelativeLayout嵌套了一個LinearLayout
然後在分析這個頁面的滑動~
先把要滑動的圖檔放進來:
private ViewPager viewPager;
private int[]images={R.drawable.guide_1,R.drawable.guide_2,R.drawable.guide_3};
private List<ImageView>imageViews;//用來存放幾個imageview的執行個體
執行個體化并且加載擴充卡:
viewPager.setAdapter(new MyAdapter());
imageViews=new ArrayList<ImageView>();
for(int i=0;i<images.length;i++){
ImageView imageView=new ImageView(this);
imageView.setImageResource(images[i]);
imageViews.add(imageView);
class MyAdapter extends PagerAdapter{
@Override
public int getCount() {
// TODO Auto-generated method stub
return images.length;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
return arg0==arg1;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
// TODO Auto-generated method stub
container.addView(imageViews.get(position));
return imageViews.get(position);
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// TODO Auto-generated method stub
container.removeView((View)object);
}
}
其實寫到這裡就可以完成圖檔的滑動,但是還沒有小紅點的出現~這時候就要寫小紅點了~小紅點預設是在第一頁就出現了的~
在drawable檔案下寫了倆個xml檔案,red_circle--代表紅點,gray_circle--代表灰點~
red_circle:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<size
android:width="10dp"
android:height="10dp"/>
<!-- 填充顔色 -->
<solid
android:color="#ff0000"/>
</shape>
gray_circle:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<size
android:width="10dp"
android:height="10dp"/>
<!-- 填充顔色 -->
<solid
android:color="#ECECEC"/>
</shape>
現在代表顔色的檔案寫好了,那怎麼把它們加進去呢~~
先預設都是灰點,然後在把紅點覆寫上去,看代碼怎麼寫:
ImageView gray_Iv=new ImageView(this);
gray_Iv.setImageResource(R.drawable.gray_circle);
//使用LayoutParams改變控件的位置
LinearLayout.LayoutParams layoutParams=
new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
if(i>0){
layoutParams.leftMargin=20;
}
gray_Iv.setLayoutParams(layoutParams);
li.addView(gray_Iv);
把灰點都加到LinearLayout裡面
而紅點:
red_Iv=new ImageView(this);
red_Iv.setImageResource(R.drawable.red_circle);
rl.addView(red_Iv);
把紅點加到 RelativeLayout裡面
還要寫個示圖樹~讓紅點來滑動:
//示圖樹
red_Iv.getViewTreeObserver().
addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
//該方法就是在界面全面繪制結束之後回調
@Override
public void onGlobalLayout() {
// TODO Auto-generated method stub
//求距離
left=li.getChildAt(1).getLeft()-li.getChildAt(0).getLeft();
System.out.println("left為"+left);
red_Iv.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
});
viewPager的滑動監聽器還要監聽圖檔什麼時候滑動,以至于讓紅點滑動的跟好看(就比如第一個點到第二個點的途中也會有紅點)
//滑動的時候
@Override
public void onPageScrolled(int position, float posionOffset, int arg2) {
// TODO Auto-generated method stub
System.out.println(posionOffset);//滑動的百分比
RelativeLayout.LayoutParams layoutParams=
(RelativeLayout.LayoutParams)red_Iv.getLayoutParams();
layoutParams.leftMargin=(int)(left*posionOffset+position*left);
red_Iv.setLayoutParams(layoutParams);
}
還要分析下讓“開始體驗”這個Button出現在最後一頁,那就隻能在viewPager的滑動監聽方法裡面寫可見與不可見了~
@Override
public void onPageSelected(int position) {
// TODO Auto-generated method stub
if(position==images.length-1){
btn.setVisibility(View.VISIBLE);
}else{
btn.setVisibility(View.GONE);
}
}
完整MainActicity代碼:
public class MainActivity extends Activity {
private ViewPager viewPager;
private int[]images={R.drawable.guide_1,R.drawable.guide_2,R.drawable.guide_3};
private List<ImageView>imageViews;//用來存放幾個imageview的執行個體
private LinearLayout li;
private RelativeLayout rl;
private ImageView red_Iv;
private int left;
private Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
viewPager=(ViewPager) findViewById(R.id.viewPager);
li=(LinearLayout) findViewById(R.id.linear);
rl=(RelativeLayout) findViewById(R.id.rl);
btn=(Button) findViewById(R.id.btn);
viewPager.setAdapter(new MyAdapter());
imageViews=new ArrayList<ImageView>();
for(int i=0;i<images.length;i++){
ImageView imageView=new ImageView(this);
imageView.setImageResource(images[i]);
imageViews.add(imageView);
ImageView gray_Iv=new ImageView(this);
gray_Iv.setImageResource(R.drawable.gray_circle);
//使用LayoutParams改變控件的位置
LinearLayout.LayoutParams layoutParams=
new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
if(i>0){
layoutParams.leftMargin=20;
}
gray_Iv.setLayoutParams(layoutParams);
li.addView(gray_Iv);
}
red_Iv=new ImageView(this);
red_Iv.setImageResource(R.drawable.red_circle);
rl.addView(red_Iv);
//示圖樹
red_Iv.getViewTreeObserver().
addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
//該方法就是在界面全面繪制結束之後回調
@Override
public void onGlobalLayout() {
// TODO Auto-generated method stub
//求距離
left=li.getChildAt(1).getLeft()-li.getChildAt(0).getLeft();
System.out.println("left為"+left);
red_Iv.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
});
viewPager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// TODO Auto-generated method stub
if(position==images.length-1){
btn.setVisibility(View.VISIBLE);
}else{
btn.setVisibility(View.GONE);
}
}
//滑動的時候
@Override
public void onPageScrolled(int position, float posionOffset, int arg2) {
// TODO Auto-generated method stub
System.out.println(posionOffset);//滑動的百分比
RelativeLayout.LayoutParams layoutParams=
(RelativeLayout.LayoutParams)red_Iv.getLayoutParams();
layoutParams.leftMargin=(int)(left*posionOffset+position*left);
red_Iv.setLayoutParams(layoutParams);
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
}
class MyAdapter extends PagerAdapter{
@Override
public int getCount() {
// TODO Auto-generated method stub
return images.length;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
return arg0==arg1;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
// TODO Auto-generated method stub
container.addView(imageViews.get(position));
return imageViews.get(position);
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// TODO Auto-generated method stub
container.removeView((View)object);
}
}
}
源碼下載下傳: 連結